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Index: .hooks/pre-commit.d/check_portepoch
===================================================================
--- /dev/null
+++ .hooks/pre-commit.d/check_portepoch
@@ -0,0 +1,27 @@
+#!/bin/sh
+#
+# Check that PORTEPOCH is not being dropped, and is non-decreasing
+#
+
+check_epoch() {
+ local makefile="$1"
+ local old_epoch=$(git diff --cached -U0 "${makefile}" | grep '^\-PORTEPOCH' | grep -oE '[0-9]+')
+ local new_epoch=$(git diff --cached -U0 "${makefile}" | grep '^\+PORTEPOCH' | grep -oE '[0-9]+')
+ if [ -z "${new_epoch}" ] ; then
+ echo "[pre-commit] dropped PORTEPOCH ${old_epoch} in ${makefile}"
+ exit 1
+ fi
+ if [ -n "${old_epoch}" ] ; then
+ if [ ${new_epoch} -lt ${old_epoch} ] ; then
+ echo "[pre-commit] PORTEPOCH decreasing from ${old_epoch} to ${new_epoch} in ${makefile}"
+ exit 2
+ fi
+ fi
+}
+
+modified_makefiles=$(git diff --name-only --cached --diff-filter=M -GPORTEPOCH | grep -E '^[^/]+/[^/]+/Makefile$')
+if [ $? -eq 0 ] ; then
+ for modified_makefile in ${modified_makefiles} ; do
+ check_epoch ${modified_makefile}
+ done
+fi

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